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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce31995b99cdf741941a91585b77838ae7b790784d0bee049bd1b5ca9296dd59' 
  AND token = 'R5T1QVt8TD9jURhiJVvTv2p4E14ZoVWa5EOv/9CBrV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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