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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688aca65deb5c2a5dfc03b0d38f0e24529b69e1c7d0a92b0a01337e2e1b9d350' 
  AND token = 'JbRMajI2b/QOT8qtGZmd77dkgB19LtRV90mbIxERQSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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