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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a883dd76a438aca27380dd702204237f90fc4686826e064ed59d9c20e526e735' 
  AND token = 'jop2t7o52Eo8ZZMk8nwUwa+ho4zl2UqhtVpcyNs2xwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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