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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c9ee934a2461a60fd60516bb593614da0c63c9ac472a31237dc05efd1ac4eb' 
  AND token = '9ZWSAVqsKgBy3HAXGgim22ktHICg1LQ/7hY5kqbpBcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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