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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068afa6303cb6c38aff602a0c3aefff2bf96ade588213d534fa51b69c61d7ab4' 
  AND token = 'vVxPJUrt2w3wzTUqeZ4fByi96V74hrPoXaNB4EOZDVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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