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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98703c8cca4d78ba5286052b596ed04fed8844f0ed24ab92758c24b2e91a878' 
  AND token = 'x4KaLZ64pVIDVu5OBEHx6cZ0OIpdy7FwvBPBvEpCPak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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