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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62141fa5e9e3f65e398222c8993e80aa003efb3301987006489b6e6e5abbbc1f' 
  AND token = 'YxqvhjqwxCNOZzGq2bnkVI6/iowOfkfhL8o4DeLsyEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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