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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a35b9ba2f10c0aee6dc0a772bae5b4ae1ef808ef643000b0006681874fd3037' 
  AND token = 'bxcCNgvn00Honot76Ic/XFSRl6MPLIGtTNY2nGG0Gfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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