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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423788f0998a118ab6b09d8921232a6a96e075087bfbc977154f01451a3f0d32' 
  AND token = 'eHdmx3JWG6zgXrbMBwrERr6qEpKRZ5HBxpWzaP4GfNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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