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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac3e537243124a5e966caf3136b433cf53d712a0ed20c119f64fba466ad37e0' 
  AND token = 'Qt796c47VlZYBl3TbmEZSM7mUEqc6PencU3Mr8GDtu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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