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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4482c06b46492791692e41337273e852e5b6b892814c59d72274a383ec6b8a78' 
  AND token = '8AUhr2HSXmKVsJomAAwo3H3gxyX55QO9f6AIptrjUz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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