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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b926a26f1fb51236050834b8fd630661182b1d5bea8e0da4f45a1f3e07b7a242' 
  AND token = 'Q4vSwO0CFPl6ytMnGKsiaIaX/ZIIx2omVU3i+Sv9Nyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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