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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8346a089d696e677ca19868be5b2d7096a2538dc46c5bf7473a69077eec2c8bb' 
  AND token = 'inE9dT0vB+NusuED3c8rrqG9a1uozrUzo+2gsyaPd8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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