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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054e61a2f2d416d1b5c6ac5f2b564cf33efc802c4c6c99e0260db82f84d1e9c1' 
  AND token = 'HgSpWa4H2nmSIBSgtxP75mA/CdiQuBDdLVdPFPfLPRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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