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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4570c69af10d6f0df95039f57580692367272affdc68972ee6377d2a21352d' 
  AND token = 'l29uc9RFW6rxs7aL7UtXysoyB58KkdXNI+PaW+YVo/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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