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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1047682d0c7e413f6bb9ddffe6347cf2cd93ef5abeb7f3ad98d8be780b8ac4' 
  AND token = 'b9rPz2i5ZYnIJcvx3j0hf7UwwitzrybvLXo9o7FiDjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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