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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce6275d0340cb18f30b1dd3ad23b64658546ee936de5ada84c76fb1208ae9cf' 
  AND token = 'oz1JKpnVIUlH0fB1Yrbdmid5F9d3FowXz4TZt710PTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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