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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b60f6665bf3b2c1e820cc31ea6988bf3b632fa971d516e27a42da0c9aac1cc6' 
  AND token = '59UyBqrRyO5DVgpQxYUW2mTG02ddDgRYk3axPtJ0auY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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