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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd957d3bafc08b6087add37e92f3719530b06ecef465c50f748bde5b0984e4100' 
  AND token = 'tZh9yiAnttbZlFL3Q8OC001bbR7CgDhBIBZEKyLUP90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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