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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cd8895c8db04b69ea33ea148871490dea19d357f16be768188dcf71dcde2b5' 
  AND token = 'l+lp0/lXLRc2LxQxzXJHehStsf6j4xxWBLJxXycP4ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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