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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ec8bf9e151652a5494e385c72b1a4b89a8346e29adad86ea7ae0305b38d4c7' 
  AND token = '7szHUlbfWFsLMJfOcaz78iSx0pkMD4slNR06sxELF0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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