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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3aad3cdc93ce6f8a43612c59055cdb958c7d568039dcd5fcb4094235a66e93e' 
  AND token = '57kSsmc1/oZjdyKAXs9ncf/YFp/EQg/8cu+tj+KE+bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}