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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80e51b327d319f8bed8038ad8337f6d164da0b8ba31ac60b90893a1b02294fb' 
  AND token = '9jGTcU2A6oy/ZkO5rF0ZFguukEh7mtAwLkN6+tcxzS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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