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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d46810fbb3dcf4dbe361b0191a3a4b8a68ebeb15046f5955e2fe9e49a67540' 
  AND token = '1caRSPJEiltLkAEA2Ljb3vu68oNIZbqUD6NDECIM9MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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