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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf2f01f39fbf90119b62e73148512a202571143c83e5952b4033009de7c7a69' 
  AND token = 'hWR7csE96irB/k2Ffi3exX0/7b8uuCpOZsB1maqyXlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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