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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccabbb284d82188fc826e15350fd7118fe45dc34e28a50ab8754759bb1c0517c' 
  AND token = '3lez4g4pMpWE/agi2CLqbTjaP7Ymc0613q7dFwiaQVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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