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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d97aa5e357c844b223efaabb02b9b8edb3c67feccb93a8b8fdaaa3d8d13d89' 
  AND token = 'dMxuyMbaTI4KJ0V/cR8VEWnC+jspp9mikLDxkABgOtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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