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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cac276b6dae02043a59047c4ec83a20314e9ac2770614830e44dbdaff388a26' 
  AND token = 'tIubXBamonwtTvcWL54C8C6nb1mKz5TRtGAMT3tJxQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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