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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb6fa99b8942bd7c908210a0a9933a28bd420072df04a2c72a61642f4b01f51' 
  AND token = 'ilLKhpXVxIC6jNnh/TTGC7V63eS/xTwfZu8x9jbD/EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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