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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d576d42da16b573a66b9e58b449bbb27d4d4855e16badb60ed92c37154e09c' 
  AND token = 'Jg4uEmR1JdPvL6L00hK29CTJZsUB+iBAydDVBTwnr5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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