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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9242f65d0a7e992f5e95c572305a4c0aae127a5bb81f2c34b63f7ee71dbc74c1' 
  AND token = 'aF3wtE0b0ecr/5bkhttXl7TvOvpYXOZxNu/MD/CkG14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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