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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7e07c4edcf809dcf2081e90a2efb7d57e6443d4275a42f81f53b38e17125d5' 
  AND token = 'SOM/Emd7AcT7dCkPGL/veghh3CpOlcSDC3mCNDNjkf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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