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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ba98c265f2b05f89f25ba63b64fc6382af5a2f040ea10dee48fe8be6cacc4e' 
  AND token = '7g9NZV6Do5vdQZEacfGYBIjanRx6MFmtLe1woWlIQ9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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