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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ad1f27d94b07304ddfa557a2c217a3eb1b361abf9718947013c2714911d675' 
  AND token = 'U0MNtw94PbXwfxgeUGmFYBJ6QciKPt4dolbCt47Bqis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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