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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2242277c9474e9fbb5bb4fd8c3283148e20243515da5e0b4bd7528f71031d9' 
  AND token = 'ImFlNhRK2IPpeKQk4eJTHaoVuY3qaD4xwXg5wELS1W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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