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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceabb7676793828f718b6af3b926ecbe324d9ca12fce554c3d08b22270e0e3b2' 
  AND token = 'imh1LX5FIJMgNLeH/44PyQZ9hnVCKi+23pSVRyDjIHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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