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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd09d5fe8c63742ea17f03683d1898e39a3fd00cdcb1b1153be02af24656601' 
  AND token = 'ibzwWasf+YzAicFREnWqmZF3cx+FUm1ks/nY2xcdun4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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