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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7257b093b551268c0845dffc4751cea0d5edb12820d356741c4690ef0f7734d5' 
  AND token = 'fLKT1IVcSNJav7et6E+FhlXbMsCLcZus955WGU5s1R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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