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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c362eb935430f49485f362034cff54633b3528519b59951bfc65e2d59d949030' 
  AND token = '9TJfGYsLZKv2s8xx8S35UAo1fawvqVjJrNpvRRl33t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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