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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7c1cf54068204619ade0842960445e9db930e5470332cbc539a24fb4c5e3d2' 
  AND token = 'SlVHWbxvkWi+rmjk+rirdNc17IoLRHSqTG1TJRBxDcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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