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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed4d9d4352f63cb0fcc383adcb6515075169f39d05c5cd4bad2782986e1f9f1' 
  AND token = 'uyRNQbYKxqLpMX9wnh3XTeaHSJf1moWFzO8Q8OTuCQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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