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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e0e0fa89ba360fb5c20933c4d8dc84e14b406e23bac6140032c5560142e456' 
  AND token = 'g5X+W9FBqsNrYgYtNdlQ0Suoks33Khk0bpQ2qlfJwc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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