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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d92b1d72fb1c8aa6f000e543d632693894aeca56f53388b543d1ae8754ca668' 
  AND token = '/fcFex6+sUuWO35m38LONi8X8t9lk08sfymW51ey8qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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