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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2663ef4686b106e2ce36ba137abc36e2c12e705c59930cdb01dd9248f5156f94' 
  AND token = 'Er/4H8em0Lg22CcEbu39jCCYeBWNod25nhQZaOLo1rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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