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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c082db0aa3e30f343de090ea8639489fbec71621c0fa0d2fda0af5f470de23ba' 
  AND token = 'ycd92P7/UZJx+Wl8RW9A2LLflhLnT3wSZNDUkn1RYRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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