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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb2b219fce062d4159ee577da69826ebf95f5104976fdd1d1bf5e0864716350' 
  AND token = 'n1o+q+qZ8rp9z6UXnStXDbiQ2iz0D/vGu9P4oc2x8bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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