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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1423ef0013e3327587994c8df3b8958f2b96898a1a6d3ac2f7eb6851441da9fe' 
  AND token = 'hJW372gV+PRo+tjKh47CVkeORF4YH0Qg0E7sypeyH5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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