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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ff5b4eab4dd914cddbc4b80227492b024768b0f6a87850e87eb1ae2c7bc05f' 
  AND token = '19b3jrlEnPa0OQRemqtVKcB1f3OrZNuhRra1khcNn8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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