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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e80f0085306e1afde074b4443034867f987206d2ebd8cfb87e20d6501debfb3' 
  AND token = 'JgGE5lOS7qwDN2/DblEi1eELlaYql/cFUo5tQju4+r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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