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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5824df1c4e32a41796fa454efaf082a53f9e6c173083773663229ca52bb70aa7' 
  AND token = 'd2ccSEHMhCiU1LNElaPcfKGQTut6n2Z9Opop52o6VFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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