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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bfb5ac62639fac74d22d3826971df5e7e50d1829fd9762a5757a180eaf6bb7' 
  AND token = 'pt+GB/2enlEl1AolG8XsTVbTU2hR0APRjhvkEyQ2iOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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