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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e928445b699d1f4016e4c2424c329bbde8c9a8f395892d09c64978ce111ea3b' 
  AND token = 'oKZUnAJ1TNa5X+bb9s0whthy4AX6ZJ0xBLOrd8Hr3Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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