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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611e6d4e52f21c7df87144058bd361718dde2433353adb2d5e0b079b60eb2cca' 
  AND token = 'PeuubCE0vPreKaBwLzEVRmDUbI/LlxPfMKDjv7wI1Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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