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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba79577f05b3158040d29b32f2c39394c4a742fba9d1682e6f4bc55c9e91795' 
  AND token = '86TtQfkOJEtyAFyWBk9QYkBNPpPW/SwmmPZAeAf68uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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