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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3742f1f3422ce126f003f8b2e0b6f2e440ea86fa17a7e8438c55bc73e4ec230b' 
  AND token = 'nFWjj7xzSgQ4slc+lgLYldGv8pQQwYp9B5Qjwxr73qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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