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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e97f39890198baf82460e75d124f415abae647a9c8b2ccd55857f1c90d927b7' 
  AND token = 'ZFWGK4oUzVHvpMPe+6a/1OdT+vSTQ4Avt4D/0LuHf0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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