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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd2501b6356c840e08c4b2bb650c9cb4c173406cfa379319f08e8fd21eaafd8' 
  AND token = 'QALnLfT8t7eI29sPREBf+kvPbqCqDvgAirPKaXz0igk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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