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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f5b9c15137088742e7e5291b2a7f03d93a5a003a0f508f087cc79c0b8620ac' 
  AND token = 'Pob+uPlZrQblCG/5Z9ZtjU/WOV8lije4Qx2ajOq9q4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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