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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e228394653cd5365d6457cdd55557f570fe739005993d2eea287bc726f900e44' 
  AND token = '8RgVu667/RYGFMRRDLsZKuW0dN/2m18ffQ4Qod7IdYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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