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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c1026c8d251cb54b7c4f2fcd8b23f362e3367ab9dd0f74b3bfacd4b1d09780' 
  AND token = 'J/AffQ6WgQTs+mm4LfYwXpSYDKQsGTa4yqwxLc6a1/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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