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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1983a5b19ae6611c11673f0a54717a0e1afd4f328e41629250734377331b0ce' 
  AND token = 'UB655fJ+p24NdvlPeh4ueosCkM7W5pitG820QpogBVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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