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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1955bf0cc4991ae289f5893de7a9e7a2e9b972d08eb2e25c954f25be314c5a36' 
  AND token = '55om0bVUHLxjFv9qNzN8++qy/LbtxF8rLGi49Qj9NI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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