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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a8177aad8fbdb0a9a36b82e7085b754cdc9f0535d33413557acf58964b94f9' 
  AND token = '9XZdqobEf/MgP858EanAJKod7XdpPqfEuJ9JxOhyc3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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