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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca91773325717a8377286448ede162aa62a6594aebdfebc399cffe201b1f25c7' 
  AND token = 'Q1jluh1sMIO9PltnMs6kwqkdSEGd38woYaXfOJWfnlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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